用LARAVEL做一个图书管理系统

Laravel是一个基于PHP的开源框架，用于构建Web应用程序。在Laravel中，我们可以使用Eloquent ORM来创建和管理数据库表。以下是一个简单的图书管理系统的示例：

1. 首先，创建一个名为`Book`的模型，用于表示图书信息：

```php

namespace AppModels;

use IlluminateDatabaseEloquentModel;

class Book extends Model

{

protected $fillable = ['title', 'author', 'publisher', 'price'];

}

```

2. 接下来，创建一个名为`Library`的模型，用于表示图书馆信息：

```php

namespace AppModels;

use IlluminateDatabaseEloquentModel;

class Library extends Model

{

protected $fillable = ['name', 'address'];

}

```

3. 创建一个名为`User`的模型，用于表示用户信息：

```php

namespace AppModels;

use IlluminateDatabaseEloquentModel;

class User extends Model

{

protected $fillable = ['name', 'email', 'password'];

}

```

4. 创建一个名为`Booking`的模型，用于表示预订信息：

```php

namespace AppModels;

use IlluminateDatabaseEloquentModel;

class Booking extends Model

{

protected $fillable = ['user_id', 'book_id', 'date'];

}

```

5. 创建一个名为`LibraryBooking`的模型，用于表示图书馆预订信息：

```php

namespace AppModels;

use IlluminateDatabaseEloquentModel;

class LibraryBooking extends Model

{

protected $fillable = ['user_id', 'book_id', 'date'];

}

```

6. 创建一个名为`BookingController`的控制器，用于处理预订和取消预订操作：

```php

namespace AppHttpControllers;

use IlluminateHttpRequest;

use AppModelsBooking;

use AppModelsBook;

use AppModelsLibrary;

use AppModelsUser;

class BookingController extends Controller

{

public function index()

{

$books = Book::all();

return view('bookings.index', compact('books'));

}

public function create()

{

$books = Book::all();

return view('bookings.create', compact('books'));

}

public function store(Request $request)

{

$book = Book::find($request->book_id);

$user = User::find($request->user_id);

$booking = new Booking;

$booking->user_id = $user->id;

$booking->book_id = $book->id;

$booking->date = $request->date;

$booking->save();

return redirect()->route('bookings.show', ['book' => $book, 'user' => $user]);

}

public function show($book_id, $user_id)

{

$book = Book::find($book_id);

$user = User::find($user_id);

$booking = Booking::where('user_id', $user->id)->where('book_id', $book->id)->first();

if ($booking) {

return view('bookings.show', compact('book', 'user', 'booking'));

} else {

abort(404);

}

}

public function destroy($book_id, $user_id)

{

$book = Book::find($book_id);

$user = User::find($user_id);

$booking = Booking::where('user_id', $user->id)->where('book_id', $book->id)->first();

if ($booking) {

$booking->delete();

return redirect()->route('bookings.index');

} else {

abort(404);

}

}

}

```

7. 创建一个名为`BookingsController`的控制器，用于处理所有与图书预订相关的操作：

```php

namespace AppHttpControllers;

use IlluminateHttpRequest;

use AppModelsBooking;

use AppModelsBook;

use AppModelsLibrary;

use AppModelsUser;

use AppModelsLibraryBooking;

class BookingsController extends Controller

{

public function index()

{

$books = Book::all();

return view('bookings.index', compact('books'));

}

public function create()

{

$books = Book::all();

return view('bookings.create', compact('books'));

}

public function store(Request $request)

{

$book = Book::find($request->book_id);

$user = User::find($request->user_id);

$booking = new Booking;

$booking->user_id = $user->id;

$booking->book_id = $book->id;

$booking->date = $request->date;

$booking->save();

return redirect()->route('bookings.show', ['book' => $book, 'user' => $user]);

}

public function show($book_id, $user_id)

{

$book = Book::find($book_id);

$user = User::find($user_id);

$booking = Booking::where('user_id', $user->id)->where('book_id', $book->id)->first();

if ($booking) {

return view('bookings.show', compact('book', 'user', 'booking'));

} else {

abort(404);

}

}

public function destroy($book_id, $user_id)

{

$book = Book::find($book_id);

$user = User::find($user_id);

$booking = Booking::where('user_id', $user->id)->where('book_id', $book->id)->first();

if ($booking) {

$booking->delete();

return redirect()->route('bookings.index');

} else {

abort(404);

}

}

}

```

8. 最后，创建一个名为`BookingsRoute`的路由，将视图文件映射到相应的控制器方法上：

```php

use IlluminateSupportFacadesRoute;

use AppHttpControllersBookingsController;

use AppHttpControllersLibraryBookingController;

use AppHttpControllersBookingController;

use AppHttpControllersLibraryController;

use AppHttpControllersUserController;

use AppHttpControllersBookController;

use AppHttpControllersLibraryController;

use AppHttpControllersUserController;

use AppHttpControllersBookController;

use AppHttpControllersLibraryController;

use AppHttpControllersUserController;